Chọn phương án đúng: Cấu hình e hóa trị của ion CN- là (chọn z là trục liên kết)

(σ2s)2(σ∙2s)2(σ2px)2(π2pxπ2py)4(σ2s)2(σ2s∙)2(σ2px)2(π2pxπ2py)4

(σ2s)2(σ∙2s)2(π2px)2(σ2px)2(π2py)2(σ2s)2(σ2s∙)2(π2px)2(σ2px)2(π2py)2

(σ2s)2(σ∙2s)2(π2pxπ2py)4(σ2px)1(σ∙2px)1(σ2s)2(σ2s∙)2(π2pxπ2py)4(σ2px)1(σ2px∙)1

(σ2s)2(σ∙2s)2(π2pxπ2py)4(σ2px)2(σ2s)2(σ2s∙)2(π2pxπ2py)4(σ2px)2